Backpack



FIG. 1 is a front perspective view of a backpack showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a front view of the backpack shown in an alternateconfiguration with a lower pocket opened.

The broken lines are shown for the purpose of illustrating portions ofthe backpack that form no part of the claimed design.

CLAIM The ornamental design for a backpack, as shown and described.